import { NextRequest, NextResponse } from 'next/server'
import { UserService } from '@/lib/services/database-service'
import { PasswordResetService } from '@/lib/services/password-reset-service'
import { v4 as uuidv4 } from 'uuid'

const userService = new UserService()

export async function POST(request: NextRequest) {
  try {
    const { email } = await request.json()

    if (!email) {
      return NextResponse.json(
        { error: '請提供電子郵件地址' },
        { status: 400 }
      )
    }

    // 檢查用戶是否存在
    const user = await userService.findByEmail(email)
    if (!user) {
      return NextResponse.json(
        { error: '該電子郵件地址不存在於我們的系統中' },
        { status: 404 }
      )
    }

    // 撤銷用戶現有的重設 tokens
    await PasswordResetService.revokeUserTokens(user.id)

    // 創建新的重設 token
    const resetToken = await PasswordResetService.createResetToken(user.id)

    // 生成一次性註冊連結
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000'
    const resetUrl = `${baseUrl}/register?token=${resetToken.token}&email=${encodeURIComponent(user.email)}&mode=reset&name=${encodeURIComponent(user.name)}&department=${encodeURIComponent(user.department)}&role=${encodeURIComponent(user.role)}`

    return NextResponse.json({
      success: true,
      message: '已生成密碼重設連結',
      resetUrl: resetUrl,
      expiresAt: resetToken.expires_at
    })

  } catch (error) {
    console.error('忘記密碼錯誤:', error)
    return NextResponse.json(
      { error: '處理請求時發生錯誤' },
      { status: 500 }
    )
  }
}